N1(alpha, alpha-dimethyl-,beta-phenyl-propionyl) sulfanilamides



Patented Oct. 28, 1947 No Drawing. Applicatio No. 551,074. In Swi n" duijgiisjt" zlit; sear tzerland septemter' 14;

4 claims. (01. zed-sets) In Letters Patent (Ser. No. 456,942) a process for the: productionof p-aminobenzene-sulfonacylamides has been disclosed consisting in that sulfonamidesofthe benzene series or their salts; which contain a nitrogen-containing group in? p-position', are caused to react with unsaturated branched, aliphatic carboxylic acidsor their functional' derivativesrespectively; if necessary-inthe; presenceof catalysts or acid-binding'agents; andthat the p-pos-itione'd" nitrogen group is if de sired; converted :into 'an amino'group. According to a'special modificationofthis method-the sta'rt: ingmaterials are" benzene-sulfochlorides' which are substituted'iir acorresponding-manner, these benzene-sulfochlorides being then condensed with the amides of the definedcai'boxylic acids.

We have now found that especially valuable p-amino-benzene sulfoacylamides of the general formula 7 wherein R1, R2 and R3 have the above meaning," or with reactive functionalderivative's thereof and-ifdesired-converting the'p=po'siti'oned; nitrogen-containing group into an amino group.

Compounds of this nature have not yet become known heretof'ore;- theyare distinguished from the known p-amino-benzene-sulfonacylamides by their improved and superior efiicacy against infection promoters andby their lower toxicity.

As sulfonamides of the' benzene series which in" the p-position to the sulfonamidegroupcontain a nitrogen-containin'g group; may "be; mentioned:

an he like. The nitr'o" rouemay be replaced by cthefgrdup; capable ofbeiri'g converted by reduction" may theian'iiiid group, for example by the nitroso, azd azmiyor hydrazo group.

again. Such radicals arefor example the acetyl or the, carbomethofxy'" radicals, which i are easily split off againfby a" hydrolytic treatment without" affecting the ac'ylate'cl sulfonamide "group;

{The sulfonamides of the benzene series, 1'5 stituted in thej mpo'sitiori by a nitrogen-containsulfonamide or potassium p acetylaminobenzene sulfonamide. The reaction with the acylating 29' agents may also be carried out in theusual way in the presence of bases; suchas pyridine, dimethyl anilin'e'and'soon'. v

As carboxylic acids of the general formula wherein R1, R2" and R correspond to the above definition; come into consideration low' molecular as well as high molecular carboxylic acids. For example R1 to'Rs-canrepresent methyl, ethyl,

propyl, isopropyl;butyl, isobutyl, sec. butyl, all'yl,

crotyl; amyl, isoamyl, hexyl, isohexyl, heptyl, v isohepityl, octyl, isoo'ctyl, non'yl isononyl, .etc;

Amongthese purely aliphatic acids may be'enu'merated for instance:aza-dimethyl-a ethyl calmdimethyl-a-propyl-, a oc-diIIlBthYl-oc-blltYL, oz iadimethyl-u-isobutyl-,l aia-dimthylw-n amyl-, a Z-a'- dimethyloc-'isoamyl-,- a a-dimethyl-a-hexyb',

on! dimethyl-u-heptyL, ma dimethyl-w-octyb,

a: -dimethyb'e-dodecyl acetic acid, etc., or' odddiethyla-methyb; a for :a-triethyb, u a diethylu-propyb, at'a-diethyl' d-butyl otIa-dlBilhYl-otamyle, aza-diethyl-u-hexyl or eza-diethyl -aheptyl-acetic acid and" the like or wmethy'l-a ethyl -ru propyl-a c e ti c acid, a methylc-ethyb' a-allyl-acetic acid; 'u-methyl-u e t hy l-oc=butyl'-" acetic acid, a-methyl-a-ethyl-u-amyl-acetic acid vor a-methyl-a-ethyl-a-heXyl-acetic acid, or also a-IIlGthYl-aioc-d i p r on y l acetic acid, a-methylaia-dibutyl-a'ceti'c acid," a rnethyl-oiza-diamylacetic' an id," or" -"m'et hy lz p ropyl'-- oe"--butylacetic acid," or u it; :a-tripropy1'-; are i a -tr ibutyl-, a'tuzw-triamyl-acetic acid, etc.

p-aminobenzene-sulfonamide; p ac'ylaminoben 511211 the o ng" comD y be m mg groummay be" used as" such; or in th' form 0;? their salts, for example sodium p-nitrobenzene As further ex' a c e t i c acid, a:a-dimethyl-a-hexahydrobenzylacetic acid, u-methyl-e:a-bicyclohexyl-a c e tic acid, a:a-dimethylchaulmoogryl-acetic acid, etc. The said acids are partly described in the literature; if this is not the case the same can be obtained according to known methods.

A special modification of the present method, leading to the same products, consists in that benzene sulfohalides which contain in p-position a nitrogen-containing group are condensed with salts of amides of the general formula wherein R1, R2 and R3 correspond to the meaning given in the introductory part, and that the ppositioned group is if desired converted into a free amino group.

The present invention is now illustrated, but not limited, by the following examples, wherein the parts are by weight.

Example 1 38.1 parts of a-methyl-a-(n-propyl) -a-(n-butyD-acetic acid chloride are boiled under reflux for several hours with 200 parts of chlorobenzene, 1.5 parts of copper powder and with 42.8 parts of p-acetylaminobenzene-sulfonamide. The reaction mass is introduced under stirring into a dilute sodium carbonate solution and subsequently filtered. The organic solvent is separated and the aqueous solution acidified, whereby the raw acetyl compound precipitates out. The same is heated for 1 hour to boiling with 20 parts of sodium hydroxide in 100 parts of water. After acidification, the p-aminobenzene-N-[cl-methyla- (n-propyl) -a- (n-butyl) -acetyll -sulfonamide is obtained which crystallises, after reprecipitation from a sodium carbonate solution, from methanol in beautiful, almost quadratic leaflets of melting point of 216-2l'l C.

Instead of p-acetylaminobenzene sulfonamide, also its sodium salt is suitable for the condensation with oL-IIlGlJhYl-oc- (n-propyl) -o- (n-butyl) acetyl chloride.

The same compound may quite well be produced for instance with p-nitrobenzene-sulfochloride and with u a a-methyl-propyl-butyl-acetamide and by a subsequent reduction or also from p-nitrobenzene-sulfonamide and a c a-methylpropyl-butyl-acetyl chloride and by reductionaccording to Bchamp or according to another method.

Example 2 32.5 parts of aza-dimethyl-a-(mbutyl) -acetylchloride are added dropwise to 23 parts of p-carbomethoxyamino-benzene-sulfonamide in 200 parts of chlorobenzene and the Whole is heated under reflux for several hours with 1 part of 4 copper powder. After expelling of the chlorobenzene by means of steam the carbomethoxy derivative is dissolved in a cold sodium carbonate solution, then a little quantity of unconsumed starting material is filtered olf and the filtrate is poured onto ice and hydrochloricacid. By saponification with dilute caustic soda lye the p-amino- 'benzene-N- [a a-dimethyl- (n-butyl) -acetyll -sulfonamide of the melting point of 199-2G0 C. is obtained.

In an analogous manner the p-aminobenzene- N- (a:a-dipropyl-a-methyl-acetyl) sulfonamide having the melting point of 227-228 C. may also be produced.

Example 3 393 parts of a:a dimethyl-a-benzylacetyl chloride are added dropwise, while stirring and cooling, to 40.4 parts of p-nitrobenzene-sulfonamide in 250 parts of pyridine. Then the reactionmass is heated for some hours to 60 C. and subsequently poured onto ice+hydrochloric acid, the nitro derivative being precipitated first in a somewhat sticky form, but crystallising on standing The condensation can also be carried out in nitrobenzene in the presence of anhydrous aluminium chloride or phosphorus pentoxide. After precipitation from a sodium carbonate solution reduction is efiected with iron and acetic acid, according to Bchamp, whereby the p-aminobenzene-N (a:w-dimethyl-a-benzyl-acetyl) sulfonamide is obtained. By recrystallisation from alcohol and dioxane the product can be obtained in a quite pure form. Melting point 213 C.

Example 4 23.1 parts of em-dimethyl-a-(o-chlorobenzyl) acetyl chloride in parts of chlorobenzene or in another inert solvent are boiled under reflux for some hours with 20.2 parts of p-nitrobenzene-sulfonamide and with 2 parts of copper powder. The chlorobenzene is subsequently distilled by means of steam and the residue introduced under stirring into a warm sodium carbonate solution. The solution is treated with animal charcoal and then filtered. From the filtrate the nitro compound is precipitated with acetic acid and reduced according to Bchamp. The so-obtained p-aminobenzene-N- [a a-dimethyl-u- (o-chlorobenzyl) -acetyll-sulfonamide is recrystallised from alcohol and has then a melting point of 158 C.

In a very analogous manner the following compounds may be prepared: p-aminobenzene-N- [1x2 a-dimethyl-a- (m-methyl-benzyl) -acetyl] -sulfonamide, melting point C., p-aminobenzene-N- [a:adimethy1-a- (p-methylbenzyl) -acetyll-sulfonamide, melting point 215 C., p-aminobenzene-N- [azu-dimethyl-m- (m-chlorobenzyl) acetyll-sulfonamide, melting point 154 C., and p-aminobenzene-N [aza-dimethyl-a- (p-chlorobenzyl)-acetyll-sulfonamide, melting point 212 C What we claim is: 1. A p-aminobenzene-sulfonamide of the formula OHa wherein Ar represents a member selected from the group consisting of phenyl, methylphenyl and chlorophenyl radicals.

2. The p-aminobenzene-N-(ara-dimethyl-abenzyl-acetyl) -sulfonamide.

5 6 3. The p-aminobenzene-N-[aza-dimethyl-u- (m-methyl-benzyl) -acety1]-sulfona.mide. FOREIGN PAIEN IS 4. The p-aminobenzene-N-Lu:a-dimethyl-a- Number o try Date (p-chloro-benzyl) -acety1]-sulf0namide. 1123 Australia Aug. 22, 1940 HENRY MARTIN- 5 OTHER REFERENCES HANS GYSIN.

Crossley et a1., Jour. Am. Chem. Soc., vol. 61

REFERENCES CITED Oct. 1939, pp- 955.

The following references are of record in the file of this patent: 

